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Foreign key can be null, how to model

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jmoore

Post subject: Foreign key can be null, how to model

Posted: Tue Jan 24, 2006 11:45 am

Newbie

Joined: Tue Jan 24, 2006 11:15 am
Posts: 2
Location: Raleigh

Folks,

I'm sure this is a newbie question, but I have a foreign key as a property in my class. It is modeled as a .net guid and initialized to "guid.empty". When I add, I'd really like for the database to have a null inserted if the guid is empty.

Any thoughts on how to accomplish this?

Thanks!

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sergey

Post subject:

Posted: Tue Jan 24, 2006 2:58 pm

Contributor

Joined: Wed May 11, 2005 4:59 pm
Posts: 1766
Location: Prague, Czech Republic

Either use NullableGuid from the Nullables library (NHibernateContrib), or write your own custom type to translate between Guid.Empty and NULL.

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jmoore

Post subject: re: Foreign key can be null, how to model

Posted: Tue Jan 24, 2006 5:17 pm

Newbie

Joined: Tue Jan 24, 2006 11:15 am
Posts: 2
Location: Raleigh

thanks for the answer. In the end I actually changed the initialization of the class to use the .net 2.0 nullable template so....
Nullable<Guid> m_myguid;

so, instead of Guid.Empty, the property could be initialized as null. Hibernate handled this just fine.

Thanks!

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